无法从我的Android应用程序上的node.js服务器接收消息

Question

所以在这里，我的问题是我可以很好地将数据从我的android应用程序发送到接收它们的服务器node.js，但是相反，我的android应用程序无法从我的服务器Node.js接收消息

预先感谢您的帮助 ！

服务器节点

var mysql = require('mysql');
var app = require('express')();
var server = require('http').createServer(app);
var io = require('socket.io').listen(server);

io.sockets.on('connect', function (socket) {

  socket.emit('message', 'Android Connected');
  console.log("Android Connected");
  socket.emit('message', 'Android Connected');

  socket.on('message', function(message){
    console.log("message received: " + message);
    socket.emit('message', 'message received');
  });

});

server.listen(8081)

onCreate中MainActivity的相关部分

SocketBDD socket = new SocketBDD();

SocketBDD.java

package com.example.myprojectapplication.ObjectClass;

import com.github.nkzawa.emitter.Emitter;
import com.github.nkzawa.socketio.client.IO;
import com.github.nkzawa.socketio.client.Socket;

import org.json.JSONException;
import org.json.JSONObject;

import java.net.URISyntaxException;

public class SocketBDD {

    private Socket socketBDD;

    public SocketBDD() {
        try {
            socketBDD = IO.socket("http://192.168.1.22:8081/");
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }
        socketBDD.on("message", onNewMessage);
        socketBDD.connect();
    }

    private Emitter.Listener onNewMessage = new Emitter.Listener() {
        @Override
        public void call(Object... args) {
            JSONObject data = (JSONObject) args[0];
            String username;
            String message;
            try {
                username = data.getString("username");
                message = data.getString("message");
            } catch (JSONException e) {
                return;
            }

            // add the message to view
            //addMessage(username, message);
        }

    };

    public Socket getSocketBDD() {
        return socketBDD;
    }
}